mail.mailman4.com has no AAAA records.
Google
Domain verification
google-site-verification=bTToEkssbtZINey1acVzFDKfZ57UOwDrBr6Rji1VRCo
ns-1493.awsdns-58.org
Amazon Web Services
Route 53
ns-1597.awsdns-07.co.uk
Amazon Web Services
Route 53
ns-368.awsdns-46.com
Amazon Web Services
Route 53
ns-799.awsdns-35.net
Amazon Web Services
Route 53
Zone apex
Start of authority
Email
Serial
1
Refresh
2h
Retry
15m
Expire
14d
Negative cache TTL
1d